1.
Galvanic CurrentsGalvanic Currents
Dr.Deepak Anap,Asso. Professor
COPT,PDVVPF
deepak.anap@hotmail.com
Galvanic Currents - Dr.Deepak

2.
Objectives
• History
• Introduction to DC
• Graphical Representation
• Interrupted DC
• Wave form Characteristics – Duration and Frequency
• IDC Waveforms
Galvanic Currents - Dr.Deepak

3.
History
• Luigi Galvani ,an Italian Physiologist-on whose
honor galvanic current is named.
• First to show that when electric current is passed
through the legs of a frog, it twitched, way back
in 1791.
Galvanic Currents - Dr.Deepak

4.
Galvanic Currents - Dr.Deepak

5.
Definition
• In DC, electrical current flows in one constant
direction, as opposed to AC, in which the current
constantly reverses direction.
• Ex of a device that provides DC : battery.
• DC ultimately supplies power to nearly all
electronic devices (even if these devices require a
component to convert AC current into DC
current).
Galvanic Currents - Dr.Deepak

6.
DC Vs AC
Galvanic Currents - Dr.Deepak

7.
Galvanic Currents - Dr.Deepak

8.
Modifications of DC
• Interruption – most usual modification of DC
• Interrupted DC
• Current flow commencing & ceasing at
regular intervals
Galvanic Currents - Dr.Deepak

9.
Wave form Characteristics
• Duration
• Duration 100,300,600ms used for Treatment
with IDC
Galvanic Currents - Dr.Deepak
Duration

10.
• Frequency: No. of impulses/Sec
• Depends on duration of Interval between the
impulses
• Duration α 1/Frequency
Galvanic Currents - Dr.Deepak
Duration of interval

11.
Galvanic Currents - Dr.Deepak

12.
IDC waveforms
Galvanic Currents - Dr.Deepak
DC
Rectangular IDC
Current rises suddenly, constantly maintained for the
duration of the stimulus then turned off abruptly

13.
Triangular Pulses
• Traingular: has an equal phase of slow rise
and then slow falling off in intensity
Galvanic Currents - Dr.Deepak

14.
Trapezoidal Pulses
Current rises slowly, plateaus for a short
period then gradually declines
Galvanic Currents - Dr.Deepak

15.
Saw Tooth Pulses
current is gradually raised then turned off
abruptly
Galvanic Currents - Dr.Deepak

16.
Depolarised Wave Form
• Current of low intensity flows in reverse
direction
• Chemical formation because of DC is reduced
Galvanic Currents - Dr.Deepak

17.
Thank you